V4L/DVB (13127): sh_mobile_ceu: add soft reset function

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 36 insertions, 6 deletions

diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c
index 9c8b7c7b89ee..edb6ec3d2bcd 100644
--- a/drivers/media/video/sh_mobile_ceu_camera.c
+++ b/drivers/media/video/sh_mobile_ceu_camera.c
@@ -153,6 +153,40 @@ static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
         return ioread32(priv->base + reg_offs);
 }
 
+static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
+{
+        int i, success = 0;
+        struct soc_camera_device *icd = pcdev->icd;
+
+        ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
+
+        /* wait CSTSR.CPTON bit */
+        for (i = 0; i < 1000; i++) {
+                if (!(ceu_read(pcdev, CSTSR) & 1)) {
+                        success++;
+                        break;
+                }
+                udelay(1);
+        }
+
+        /* wait CAPSR.CPKIL bit */
+        for (i = 0; i < 1000; i++) {
+                if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
+                        success++;
+                        break;
+                }
+                udelay(1);
+        }
+
+
+        if (2 != success) {
+                dev_warn(&icd->dev, "soft reset time out\n");
+                return -EIO;
+        }
+
+        return 0;
+}
+
 /*
  *  Videobuf operations
  */
@@ -407,13 +441,9 @@ static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 
         pm_runtime_get_sync(ici->v4l2_dev.dev);
 
-        ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
-        while (ceu_read(pcdev, CSTSR) & 1)
-                msleep(1);
-
         pcdev->icd = icd;
 
-        return 0;
+        return sh_mobile_ceu_soft_reset(pcdev);
 }
 
 /* Called with .video_lock held */
@@ -427,7 +457,7 @@ static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 
         /* disable capture, disable interrupts */
         ceu_write(pcdev, CEIER, 0);
-        ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
+        sh_mobile_ceu_soft_reset(pcdev);
 
         /* make sure active buffer is canceled */
         spin_lock_irqsave(&pcdev->lock, flags);